199173389 has 4 divisors (see below), whose sum is σ = 201978720. Its totient is φ = 196368060.

The previous prime is 199173383. The next prime is 199173397. The reversal of 199173389 is 983371991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 199173389 - 2⁸ = 199173133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199173383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1402559 + ... + 1402700.

It is an arithmetic number, because the mean of its divisors is an integer number (50494680).

Almost surely, 2^199173389 is an apocalyptic number.

It is an amenable number.

199173389 is a deficient number, since it is larger than the sum of its proper divisors (2805331).

199173389 is an equidigital number, since it uses as much as digits as its factorization.

199173389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805330.

The product of its digits is 367416, while the sum is 50.

The square root of 199173389 is about 14112.8802517417. The cubic root of 199173389 is about 583.9967600449.

The spelling of 199173389 in words is "one hundred ninety-nine million, one hundred seventy-three thousand, three hundred eighty-nine".